Magnetogenerator for internal combustion engines



Sept. 13, 1938. G. D. CERF 2,130,316

MAGNETOGENERATOR FOR INTERNAL COMBUSTION ENGINES Filed Jan. 30, 1937 4 Sheets-Sheet l INVENT OR.

v Q Q-W/ BY (O/Cerf I A ORNEY.

G. D. CERF 2,130,31 6

Sept. 13, 1938.

MAGNETOGENERATOR FOR INTERNAL COMBUSTION ENGINES Filed Jan. 50, 1937 4 Sheets-Sheet 2 Mlle INVENTOR.

Sept. 13, 1938. G. D. CERF 2,130,316

MAGNETOGENERATOR FOR INTERNAL COMBUSTION ENGINES Filed Jan. 30, 1957 4 Sheets-Sheet 3 INVENTOR. 10mg we .lfi'erj W BY MM ATT RNEY.

Sep' t. 13, 1938. G. D. CERF 2,130,316

MAGNETOGENERA TOR FOR INTERNAL COMBUSTION ENGINES Filed Jan. 30, 1937 4 Sheets-Sheet 4 INVENi'OR. 10/111655: gas/Za0 4Q /Cer/r AT ORNEY.

Patented Sept. 13, 1938 2,130,316

MAGNETOGENERATOR FOR INTERNAL COMBUSTION ENGINES Gustave Cerf, Sidney, N. 12, assignor to Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware Application January 30, 1937, Serial No. 123,267

' 10 Claims. (Cl. 171209) The present invention relates to magnetoings 3 and 4. This rotor comprises'a cylindrical generators for internal combustion engines and permanent magnet 6 magnetized in quadrants more particularly to a. double magneto in which and having pole shoes I incorporated therewith two high tension induction coils are energized preferably by being embedded in the body 8 of from a single rotor in conjunction withaunitary the rotor which is formed by casting non- 5 form of breaker and distributor mechanism. magnetic material in and around the magnet. especially for use in connection with twin ignition 'I'herotor is fixed on shaft 2 by any suitable systems. means such as a. clamping nut 9 which forces It is an object of the present invention to prothe rotor against a shoulder II on the shaft. 10 vide a novel double magneto which is simple and According to the present invention, pairs of 10 compact in construction and eflicient and restationary pole members l2 and I3 are fixed in liable in operation. the frame I as by being cast therein in position It is another object to provide such a device to cooperate simultaneously with opposite pairs which is particularly well adapted for eiflcient of rotor pole shoes I. High tension induction shielding against radio interference. coils i 4 and i5 are provided with cores l6 and I1 15 It is another object to provide such a device in of highly permeable material rigidly connected which the various units are independently deto the free ends of the stationary pole members tachable for convenient inspection and adjusti2 and I3 respectively as by means of bolts I8 ment. and I9. Side covers 2! and 22 are detachably It is a further object to provide such a device mounted on the frame i as by means of studs 20 in which the high tension output cables may be 23 and 24 and are arranged to enclose coils l4 arranged to enter at the sides of the magneto, and i5 and receive the ends of cables 25 and 26 thus facilitating p p r e cl su e and s ield g, by which the primaries of the coils are grounded and permitting the use of shorter and more direct when it is desired to render the magneto inop- 5 cable connections. erative. 25 i It is another Object o Provide Such a device A double breaker mechanism for the two coils which incorporates a move? form of distributor i m nt d in the upper end of the frame 8 and mechanism which makes Possible the p includes two breaker devices 21 and 28 operated ment and mp fi i n of e h h t n on c by a single cam 29 suitably fixed to the drive shaft 30 Cu 2 for rotation therewith. 30

Further Objects and advantages will b 4 An output terminal block 3| is mounted in an parent from the following description taken in and cover 32 detachably fixed to the end of the connection with the accompanying w n in frame i as by means of studs 33. A circular t series 0i terminals 34 is molded in the terminal 35 7 F .1 1 a perspectlve v w of a p ferred m 3|, and a pair of arcuate conductors 35 and 35 bodiment of the invention showing one coil unit 35 (Fig. 4) is d d th r in in position to surand the distributor and output terminal unit u d t minal in spa ed concentri reladet9jched frm h body of magneto; tion therewith. Extensible conducting elements Fig. 2 is a vertical substantially mid-sectional and 38 are mounted in the terminal block 3| embodiment of the invention suitably connected as indicated at 39 to the 40 tm ed m arcuate conductors and arranged to proj t into Fig. 3 is a vertical substantially mid-sectional View f a Second embodiment of the invention engagement with the secondary terminals of oolls I4 and i5 as shown at 4|.

arrangement A distributor rotor 42 is fixed on the endof Fig. 4 is a Semi-diagrammatic repres ntati the drive shaft 2 for rotation therewith as inof the electrical and magnetic circuits employed dicaiied at 43 and is Provided with an annular in thepresent invention, together with the novel po t 44 ndin nt h pa ween th form of double distributor mechanism ther in terminals 34 and the arcuate conductors 35, 36.

employed. The distributor rotor has molded therein a pair 50 Referring first to Figs. 1 and 2 of the drawings, of conductors 45 and 46 (Fig. 4) having outthere is illus ra d m n to mp ng a frame wardly protruding ends 41 and 48 adapted to I in which i j ul' l d a d ive shalt as by cooperate with the arcuate conductors 35 and 36, means of bearings 3 and 4. A magnetic rotor 5 and inwardly protruding ends 49 and 5| circumis suitably fixed on the shaft 2 between the bearferentially spaced therefrom and arranged to co- 5:

operate simultaneously with pairs of adjacent terminals 34.

The terminals 34 are connected in pairs by means of output cables 52 to twin ignition devices 53 of the engine to be ignited, whereby each of said twin devices receives simultaneously high tension current from one of the two coils l4 and i5 in properly timed sequence as determined by the operation of the breaker mechanisms 2'! and 28 and the distributor 42.

In the operation of the device, rotation of the drive shaft 2 in timed rela ion to the operation of the engine by any suitable means such as a pinion 54 causes the magnetic rotor 5 to rotate whereby the flux therefrom is caused to reciprocate simultaneously through the cores i6 and ill of the induction coils i4 and 65. The currents induced in the primaries of the coils are suitably controlled by the breaker mechanisms 2! and 28 whereby simultaneous secondary discharges are produced by said coils which are conducted through the extensible conductors 3'! and 38 to the arcuate conductors 35 and 36 in the terminal block 3|. The conductors 45 and 46 in the distributor rotor 42 receive the high tension currents from the arcuate conductors 35 and 36 and transmit the same to adjacent terminals 34 from which the cables 52 transmit said currents to the ignition devices 53 of the engine.

In order to clarify the operation of the distributor, the twin ignition systems have been designated generally in Fig. 4 by the letters A and B, and the pairs of individual ignition circuits for the cylinders of the engine have been designated I, II, III and IV, corresponding to the engine cylinders in which they are mounted. Thus the pair of devices AI and BI are arranged to ignite the first cylinder of the engine, All and EH the second cylinder, and so on.

In the position of the distributor as illustrated in Fig. 4,,current from system A is transmitted through conductors'35 and 55 to terminal All, while current from ignition system B is transmitted through conductors 3t and iii to terminal BII whereby cylinder II will be simultaneously ignited by both ignition devices thereof. When the rotor has turned through an arc of degrees, the conductors 45 and 46 are positioned to energize the ignition devices of cylinder III through the terminals A111 and BIII, and rotation through another are of 90 degrees similarly causes energization of ignition devices of cylinCer'IV through terminals AIV and BIV. It will be noted that although the distributor rotor conductors 45 and 46 cooperate alternately with the arcuate conductors 35 and 36 which are incorporated in systems A and B respectively, the various terminals are always energized from the same ignition systems in regular sequence.

This arrangement of the output terminals in a circle within the path'of the rotor conductors which transmit the high tension current inwardly from the surrounding conductors 35 and 36, permits a shortened and simplified connection to the induction coils and the arrangement of the output cables 52 radially to the device without any terminals extending axially from the end cover. This greatly facilitates shielding of the magneto and simplifies installation problems.

In the embodiment of the invention illustrated in Fig. 3, the induction coils 55 and 56 are mounted in the side cover plates so as to be detachable therewith. This is accomplished, as there shown, by forming mounting lugs 5i on the body of the coil, forming mounting pedestals 58 therefor in the inside of the cover 59 and attaching said lugs thereto as by means of studs 6!. 62 of the coil 55 is formed to fit snugly between the ends of the stationary pole members 63 so as to complete a magnetic path of low reluctance therebetween. It will be understood that the core of coil 55 is similarly fitted between the ends of the corresponding fixed pole members 64.

The remaining elements of the structure are similar to those of the embodiment previously described and are similarly numbered, and the operation of the device is the same as above set forth.

Although but two embodiments of the invention have been shown and described in detail, it will be understood that other embodiments are possible and various changes may be made in the design and arrangement of the parts without departing from the spirit-of the invention as defined in the claims appended hereto.

What is claimed is:

1. In an ignition magneto for internal combustion engines, a casing, a magnetic rotor journalled therein, oppositely arranged stator elements fixed in said casing in position to coopcrate with the rotor, detachable covers for opposite sides of the casing, induction coils mounted in said covers with their cores positioned to cooperate with said stator elements and receive flux from the rotor therethrough, a detachable cap for the end of the casing, and breaker and distributor mechanism mounted in the end of the casing and actuated by said rotor, including a distributor terminal block mounted in said cap.

2. In an ignition magneto for internal combustion engines, a casing, a magnetic rotor journalled therein, oppositely arranged stator elements fixed in said casing in position to cooperate with the rotor, detachable covers for opposite sides of the casing, induction coils mount ed in said covers with their cores positioned to cooperate with said stator elements and receive fiux from the rotor therethrough, a detachable cap for the end of the casing, breaker and distributor mechanism mounted in the end of the.

casing and actuated by said rotor, including a distributor terminal block mounted in said cap, means for conducting primary current from said coils to the breaker mechanism, and means for conducting secondary current from said coils to the distributor terminal block including conductors surrounding the terminals of the block, and means for passing current therefrom laterally inwardly to said terminals.

3. In an ignition magneto for internal combustion engines, a magnetic rotor, a plurality of induction coils oppositely arranged at the sides of the rotor, a distributor block having a circular series of terminals coaxial with the magnetic rotor, means including a distributor rotor surrounding said terminals for conducting high tension current from said coils radially inwardly to said terminals, and output cables radiating from said terminals.

4. In an ignition magneto for internal combustion engines, a magnetic rotor, a plurality of induction coils energized from said rotor oppositely arranged at the sides thereof, a distributor block having a circular series of terminals coaxial with the magnetic rotor, arcuate conductors connected to said coils surrounding said terminals, and a distributor rotor mounted to rotate with the magnetic rotor and having conductors arranged to selectively connect the arcuate conductors to said terminals.

The core- 5. In an ignition magneto for internal combustion engines, a magnetic rotor, a plurality of induction coils energized from said rotor oppositely arranged at the sides thereof, a distributor block having a circular series of terminals coaxial with the magnetic rotor, arcuate conductors connected to said coils surrounding said terminals and spaced therefrom, and a distributor rotor mounted to rotate with the magnetic rotor and having conductors located in the annular space between the arcuate conductors and the terminals, and arranged to simultaneously connect said arcuate conductors to groups of said terminals in sequence.

6. A twin ignition magneto including a shaft, a magnetic rotor mounted thereon, a pair of induction coils located at opposite sides thereof, means for simultaneously energizing said coils by flux from said rotor, a cam on said shaft, a pair of breaker mechanisms actuated thereby to simultaneously open and close the primary circuits of said coils, a plurality of circularly arranged output terminals, and means for simultaneously transmitting high tension current from said coils to said terminals including a pair of arcuate conductors connected to said coils, and a distributor otor mounted on said shaft having a pair of conductors arranged to connect said arcuate conductors to pairs of said terminals in sequence.

7. A twin ignition magneto including a shaft, a magnetic rotor mounted thereon, a pair of induction coils located at opposite sides thereof, means for simultaneously energizing said coils by flux from said rotor, a cam on said shaft, a pair of breaker mechanisms actuated thereby to simultaneously open and close the primary circuits of said coils, a plurality of circularly arranged outputterminals, and means for simultaneously transmitting high tension current form said coils to said terminals including a pair of arcuate conductors connected to said coils surrounding said terminals in spaced relation therewith, and an annular distributor rotor mounted on said shaft located in the space between the arcuate conductors and the terminals, having a pair of circumferentially spaced conductors arranged to simultaneously connect said arcuate conductors to pairs of said terminals in sequence.

8. In an ignition magneto for internal combustion engines, a frame, a magnetic rotor journalled therein, fixed pole members in the frame cooperating therewith, side covers for the frame detachably mounted thereon, and induction coils mounted in and attached to the covers having cores adapted to cooperate with said pole members to conduct the flux from said rotor through said coils.

9. In an ignition magneto for internal combustion engines, a frame, a magnetic rotor journalled therein, fixed pole members in the frame cooperating therewith, side covers for the frame detachably mounted thereon, induction coils in the covers having cores adapted to cooperate with said pole members to conduct the flux from said rotor through said coils, a detachable end cover for said frame, a distributor terminal block mounted therein, and conductors mounted in said block detachably connected to the output terminals of said coils.

10. In an ignition magneto for internal combustion engines, a frame, a magnetic rotor journalled therein, fixed pole members in the frame cooperating therewith, side covers for the frame detachably mounted thereon, induction coils mounted in and attached to the covers having cores adapted to cooperate with said pole members to conduct the flux from said rotor through said coils, a detachable end cover for said frame, a distributor terminal block mounted therein, conductors mounted in said block detachably connected to the output terminals of said coils, a distributor rotor fixed on the end of the magnetic rotor and arranged to selectively connect said conductors to the distributor terminals, output cables mounted in said end cover beyond said conductors and extending radially therefrom, and grounding cables for the coils extending radially from said side covers.

GUSTAVE D. 

